{
  "data": {
    "a": {
      "slug": "muse-spark-open",
      "name": "Muse Spark Open",
      "vendor": "Meta",
      "vendorUrl": "https://dev.meta.ai/models/muse-spark-open",
      "kind": "model",
      "category": "inference",
      "summary": "Muse Spark Open is Meta's open-weight multimodal model for coding and agentic work, with 816B total and 42B active parameters and a 1M-token context, released on 15 October 2026 under the Muse Model Licence for self-hosting.",
      "url": "https://www.anchorterminal.com/tools/muse-spark-open",
      "markdownUrl": "https://www.anchorterminal.com/tools/muse-spark-open.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/muse-spark-open.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/muse-spark-open.json",
      "repo": "https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B",
      "license": "Muse Model Licence (source-available weights, not an OSI licence), free of charge with an attribution notice, a separate agreement with Meta before Model as a Service by a licensee group above $20M gross revenue, and the Muse Spark Open Usage Policy",
      "transports": [
        "http"
      ],
      "packages": [],
      "auth": "none",
      "authNotes": "Running the model needs no account or key. Getting Meta's weights does. Both Hugging Face repositories (BF16 and NVFP4) are gated with manual review and ask for full legal name, date of birth, country, affiliation and job title, and downloads then use a Hugging Face access token. The GGUF quantisations from ggml-org and Unsloth that Meta's docs point to are not gated. A local server has whatever authentication the owner adds, such as llama.cpp's `--api-key`.",
      "pricing": "free",
      "pricingNotes": "Free to download and run under the Muse Model Licence, with the owner's GPUs as the cost. A licensee whose group has more than $20M gross revenue in any 12 months must notify Meta and sign a separate agreement before offering it as Model as a Service. Hosted copies cost $1.25 input, $0.15 cached input and $4.25 output per million tokens on Fireworks, Baseten, Modal and OpenRouter (checked 2026-10-15). Meta Model API does not serve it.",
      "priceSummary": "from $1.25 / 1M in",
      "where": "local",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402. Muse Spark Open is a model the owner runs, with no payment route from Meta, and Meta Model API does not serve it (checked 2026-10-15).",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": null,
        "pypiWeekly": null,
        "asOf": "2026-10-15"
      },
      "docsUrl": "https://dev.meta.ai/docs/muse-spark-open",
      "llmsTxt": "https://dev.meta.ai/llms.txt",
      "capabilities": [
        "inference.llm",
        "inference.open-weights",
        "inference.local"
      ],
      "tags": [
        "model",
        "open-weights",
        "self-hosted",
        "local",
        "free",
        "gated",
        "multimodal",
        "openai-compatible",
        "llms-txt",
        "gpu",
        "new"
      ],
      "lastRelease": "2026-10-15",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 53.5,
        "grade": "D",
        "agentReady": false,
        "rank": 823,
        "ranked": true,
        "rankOf": 1218,
        "categoryRank": 22,
        "methodology": "0.7",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 69,
          "maintenance": 60,
          "payments": 50,
          "reliability": 42,
          "schema": 61,
          "security": 44,
          "transparency": 54
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-15"
        },
        "negative": 0,
        "verdict": "Muse Spark Open runs on the owner's hardware in seven runtimes, with OpenAI-compatible servers in vLLM and SGLang, standard tool calls, a 1M-token context and Meta's own serving docs. Serving the 537 GB NVFP4 checkpoint takes four B300 GPUs, Meta's download is gated by manual review, and the licence adds attribution and a revenue threshold for model resellers.",
        "bestFor": "A team with a four-GPU Blackwell node, or two to four Mac Studios, that wants a 1M-token multimodal coding and agent model on its own hardware with no prompts leaving it.",
        "strengths": [
          "816B total and 42B active parameters with a 1,048,576-token context, taking text, image, video and audio input",
          "Day-one support in vLLM, SGLang, TensorRT-LLM, Transformers, llama.cpp, MLX and Unsloth, with commands for each in Meta's docs",
          "With the `muse` parsers, reasoning comes back in its own field and tool calls as a standard `tool_calls` array",
          "The licence grants use, fine-tuning, distillation and resale free of charge, with no user cap and no regional exclusion",
          "llms.txt and Markdown docs cover checkpoints, prompting, stop tokens, recommended settings and post-training"
        ],
        "weaknesses": [
          "The NVFP4 checkpoint (about 537 GB) serves on four B300 GPUs and the BF16 one (about 1.65 TB) on eight",
          "Meta's Hugging Face repositories need manual approval with legal name and date of birth, which the Get the model page doesn't mention",
          "Products must display \"Built with Muse Spark Open\", and a company group with over $20M revenue needs Meta's agreement to offer it as Model as a Service",
          "The Usage Policy rules out military, nuclear, espionage, critical infrastructure and heavy machinery uses, and users under 18",
          "Released on 15 October 2026, with no changelog, deprecation policy or CI found, and the full evaluation report not yet published"
        ],
        "agentNotes": [
          "Start vLLM or SGLang with `--reasoning-parser muse --tool-call-parser muse` (vLLM also `--enable-auto-tool-choice`), or tool calls come back as raw text",
          "Set `reasoning_effort` to `low` or `medium` for short tasks. The default is `xhigh`, reasoning can't be turned off, and other values return an error",
          "Stop only on `\u003c|eot|\u003e` and end of text. Stopping on `\u003c|eom|\u003e` cuts off tool calls and final answers",
          "Stream long generations and leave `max_tokens` room for reasoning, or `content` can come back empty with `finish_reason` `length`",
          "Don't call Meta Model API for this model. Use a self-hosted server or a hosted provider's model string, such as `meta-models/muse-spark-open`"
        ],
        "metrics": {
          "kind": "local",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "D",
            "methodology": "0.7",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 53.5
          }
        ],
        "editorialScores": {
          "ergonomics": 69,
          "maintenance": 60,
          "payments": 50,
          "reliability": 42,
          "schema": 61,
          "security": 44,
          "transparency": 50
        },
        "provenanceScore": 57,
        "checked": {
          "categories": {
            "ergonomics": "2026-10-15",
            "maintenance": "2026-10-15",
            "payments": "2026-10-15",
            "reliability": "2026-10-15",
            "schema": "2026-10-15",
            "security": "2026-10-15",
            "transparency": "2026-10-15"
          },
          "last": "2026-10-15",
          "lastMoved": "2026-10-27",
          "oldest": "2026-10-15",
          "stale": false,
          "staleAfterDays": 90
        }
      },
      "connect": {
        "install": "hf download meta-models/Muse-Spark-Open-816B-A42B-NVFP4 --local-dir ./muse-spark-open-nvfp4\n\nexport VLLM_USE_RUST_FRONTEND=1\nvllm serve meta-models/Muse-Spark-Open-816B-A42B-NVFP4 \\\n    --tensor-parallel-size 4 \\\n    --enable-expert-parallel \\\n    --max-model-len 1048576 \\\n    --reasoning-parser muse \\\n    --tool-call-parser muse \\\n    --enable-auto-tool-choice",
        "http": "curl http://localhost:8000/v1/chat/completions \\\n  -H 'Content-Type: application/json' \\\n  -d '{\n    \"model\": \"meta-models/Muse-Spark-Open-816B-A42B-NVFP4\",\n    \"messages\": [{\"role\": \"user\", \"content\": \"Refactor this module.\"}],\n    \"reasoning_effort\": \"xhigh\"\n  }'"
      },
      "letme": {
        "capability": "https://letme.dev/inference.llm",
        "tool": "https://letme.dev/muse-spark-open"
      },
      "sameCompany": [
        "meta-model-api",
        "muse-code",
        "muse-glimmer-30b"
      ],
      "family": {
        "lab": "Meta",
        "family": "Muse",
        "url": "https://www.anchorterminal.com/open-weights/#meta",
        "others": [
          {
            "name": "Muse Glimmer 30B",
            "url": "https://huggingface.co/meta-models/Muse-Glimmer-30B",
            "params": "30B (dense, multimodal)",
            "listing": "https://www.anchorterminal.com/tools/muse-glimmer-30b"
          },
          {
            "name": "Muse Glimmer 30B assistant (DFlash drafter)",
            "url": "https://huggingface.co/meta-models/Muse-Glimmer-30B-assistant",
            "params": "2.56B (Hub safetensors count; the card states no figure)"
          }
        ],
        "olderCount": 50,
        "unrestrictedCopies": 1
      },
      "area": "models",
      "provenance": {
        "legalEntity": "Meta Platforms, Inc.",
        "domain": "meta.ai",
        "domainRegistered": "2017-12-16",
        "endpointOnVendorDomain": null,
        "terms": "https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B/blob/main/LICENSE.md",
        "privacy": "",
        "statusPage": "",
        "changelog": "",
        "securityTxt": "none",
        "checked": "2026-10-15",
        "notes": [
          "The licence names Meta Platforms, Inc. as copyright holder, and defines Meta as Meta Platforms Ireland Limited for licensees in the European region and Meta Platforms, Inc. elsewhere. The model card names the same two as model provider.",
          "The licence is the document that governs use of the weights, so it is recorded as the terms. LICENSE.md matches the text shown on the gated access form word for word. The Usage Policy is its Exhibit A. The separate USE_POLICY.md that Meta's docs link answered 401 without access and wasn't read.",
          "No privacy policy governs the model, because the owner runs it and no input reaches Meta. The access form says its details are handled under the Meta Privacy Policy on www.facebook.com, whose robots.txt asks readers like ours not to fetch it, so it wasn't read.",
          "The domain is meta.ai, where Meta's developer docs (dev.meta.ai) and research post (research.meta.ai) sit, the same as the meta-model-api and muse-code listings. RDAP gives a registration date of 16 December 2017.",
          "No hosted endpoint from Meta, so no status page. No changelog for the model was found, and the Hugging Face commit history needs access to read.",
          "dev.meta.ai/.well-known/security.txt and research.meta.ai/.well-known/security.txt returned 404 on 15 October 2026.",
          "WebFetch read the research post. It refused the Hugging Face model card as outside its allowed set, so the card, LICENSE.md, the repository and collection metadata, the discussions, the evaluation methodology PDF, Meta's docs pages and the providers' model pages were read with curl."
        ],
        "score": 57
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/muse-spark-open.json",
      "live": {
        "slug": "muse-spark-open",
        "securityTxt": {
          "url": "https://meta.ai/.well-known/security.txt",
          "state": "none",
          "checkedAt": "2026-10-27T15:31:26.149873721Z"
        },
        "llmsTxt": {
          "url": "https://dev.meta.ai/llms.txt",
          "ok": true,
          "status": 200,
          "checkedAt": "2026-10-27T14:58:42.937833008Z"
        },
        "domain": {
          "domain": "meta.ai",
          "registered": "2017-12-16",
          "source": "https://rdap.identitydigital.services/rdap/domain/meta.ai",
          "checkedAt": "2026-10-25T13:54:47.988985159Z"
        },
        "pages": [
          {
            "url": "https://huggingface.co/meta-models/Muse-Spark-Open-816B-A42B/blob/main/LICENSE.md",
            "kind": "terms",
            "status": 200,
            "checkedAt": "2026-10-27T03:48:37.834868248Z",
            "changedAt": "2026-10-27T03:48:37.834868248Z",
            "fingerprint": "1a2ca593ef84"
          }
        ],
        "models": {
          "meta/muse-spark-open": {
            "openrouterId": "meta/muse-spark-open",
            "tools": true,
            "structuredOutputs": true,
            "jsonMode": true,
            "reasoning": true,
            "input": [
              "audio",
              "file",
              "image",
              "text",
              "video"
            ],
            "promptCaching": true,
            "contextTokens": 1048576,
            "maxOutput": 943718,
            "checkedAt": "2026-10-27T23:49:19.214234221Z"
          }
        },
        "updatedAt": "2026-10-27T23:49:19.214234221Z"
      }
    },
    "answer": "Router.com (Ramp Router) scores 54.5 (C) on agent readiness against Muse Spark Open's 53.5 (D), and leads in 3 of 7 scored categories. Muse Spark Open leads on reliability and payments \u0026 pricing.",
    "b": {
      "slug": "ramp-router",
      "name": "Router.com (Ramp Router)",
      "vendor": "Ramp",
      "vendorUrl": "https://router.com",
      "kind": "router",
      "category": "inference",
      "summary": "Router.com (Ramp Router) is Ramp's LLM gateway. One API key reaches OpenAI, Anthropic, xAI and open-weight models through OpenAI Responses, Chat Completions and Anthropic Messages endpoints, with fallbacks, Flex-tier routing, shadow testing and benchmark aliases.",
      "url": "https://www.anchorterminal.com/tools/ramp-router",
      "markdownUrl": "https://www.anchorterminal.com/tools/ramp-router.md",
      "slimMarkdownUrl": "https://www.anchorterminal.com/tools/ramp-router.min.md",
      "jsonUrl": "https://www.anchorterminal.com/api/v1/tools/ramp-router.json",
      "repo": "https://github.com/ramp-public/ramp-cli",
      "license": "Closed service under the Router Terms of Service (last updated 31 August 2026). The Ramp CLI that configures coding agents for Router is MIT.",
      "transports": [
        "http"
      ],
      "remoteUrl": "https://api.router.com/v1",
      "packages": [
        {
          "registry": "npm",
          "name": "@ramp/router"
        }
      ],
      "auth": "api-key",
      "authNotes": "A Router API key, sent as `Authorization: Bearer` or `X-Api-Key`. A person signs up in the browser with Sign in with Ramp, or by email or Google with a business email address on a business domain (Gmail, Outlook, iCloud, Proton and similar are refused); other people can ask router@ramp.com for manual onboarding. Keys are created on the dashboard's API keys page and shown once, or by the Ramp CLI after browser approval. Each key can carry a lifetime or periodic spend cap and be locked, unlocked or revoked (https://docs.router.com/api/endpoint.md, https://docs.router.com/resources/signup-eligibility.md).",
      "pricing": "usage",
      "pricingNotes": "Routing is free through 2026, and models are billed at list price per 1M tokens from account credit. Router.com says the first $26 of credits are free. Requests served with the caller's own provider keys carry no Router charge, unless they fall back to Router's shared key. No routing price after 2026 was found. Per-model prices are public at https://router.com/models and https://docs.router.com/supported-models.md.",
      "priceSummary": "0% fee",
      "where": "hosted",
      "x402": {
        "level": "no",
        "evidence": "No x402, MPP or L402 in the docs at https://docs.router.com (all 41 Markdown pages read on 27 October 2026). Calls draw on account credit, and a 402 means the account has no available credit.",
        "endpoints": []
      },
      "toolCount": null,
      "popularity": {
        "githubStars": null,
        "npmWeekly": 1667,
        "pypiWeekly": null,
        "asOf": "2026-10-27"
      },
      "docsUrl": "https://docs.router.com",
      "llmsTxt": "https://docs.router.com/llms.txt",
      "capabilities": [
        "inference.router",
        "inference.llm",
        "inference.decision"
      ],
      "tags": [
        "hosted",
        "router",
        "closed-source",
        "usage-priced",
        "prepaid",
        "free-credit",
        "llms-txt",
        "openai-compatible",
        "anthropic-compatible",
        "streaming",
        "prompt-caching",
        "cli",
        "new"
      ],
      "lastRelease": "2026-10-27",
      "graded": true,
      "anchor": {
        "graded": true,
        "score": 54.5,
        "grade": "C",
        "agentReady": false,
        "rank": 798,
        "ranked": true,
        "rankOf": 1218,
        "categoryRank": 21,
        "methodology": "0.7",
        "run": "2026-10-01",
        "scores": {
          "ergonomics": 77,
          "maintenance": 59,
          "payments": 40,
          "reliability": 25,
          "schema": 58,
          "security": 66,
          "transparency": 67
        },
        "pending": [
          "performance",
          "tasks"
        ],
        "assessment": {
          "confidence": "medium",
          "date": "2026-10-27"
        },
        "negative": 0,
        "verdict": "Detailed Markdown docs with typed error codes, per-model capability data and routing an agent can set per request. No OpenAPI document, status page, changelog or published rate limits were found. Signup needs a US business email in a browser, and Ramp records prompts and outputs for a year by default unless switched off.",
        "bestFor": "Teams in the US that want one key for OpenAI, Anthropic, xAI and open-weight models, with routing to cheaper tiers and per-request cost, and can switch off content recording.",
        "strengths": [
          "llms.txt and a Markdown copy of every docs page, with a field table for each endpoint and an error reference with an action per code",
          "`GET /v1/models` returns limits, tool, structured-output, caching and reasoning support, and per-provider prices for each model",
          "Fallback lists of up to 15 provider, model and tier candidates, with timeouts that bound each attempt",
          "Every response names the serving provider, and Responses calls return `usage.cost` in USD",
          "Routing is free through 2026, BYOK requests carry no Router charge, and the first $26 of credits are free"
        ],
        "weaknesses": [
          "Ramp-side content recording is on by default and keeps prompts, outputs and tool calls for one year",
          "No OpenAPI document, status page, changelog, SLA or published rate limits were found",
          "Signup needs a US business email domain or Sign in with Ramp, in a browser",
          "No batch, embeddings or files routes, and Chat Completions lacks fallback lists and cost",
          "No routing price after 31 December 2026 was found"
        ],
        "agentNotes": [
          "Switch off content recording in Settings before sending private data. It is on by default and keeps prompts and outputs for a year",
          "Read model ids from `GET /v1/models` at runtime. Ids are account-specific, an unknown one is a 404, and Gemini ids need your own Google key",
          "Use `POST /v1/responses` with a `models` list for fallbacks. Router stops falling back once a stream has started",
          "Set `fallback_timeout` and `provider_timeout`, or `allow_flex_tier: false`, when latency matters. Flex routing is on by default",
          "Treat both `401 invalid_api_key` and `401 api_key_deactivated` as a possibly locked key, and stop retrying on `402`"
        ],
        "metrics": {
          "kind": "remote",
          "measured": false
        },
        "reviewCount": 0,
        "avgRating": 0,
        "history": [
          {
            "basis": "public evidence",
            "confidence": "medium",
            "grade": "C",
            "methodology": "0.7",
            "pending": [
              "performance",
              "tasks"
            ],
            "run": "2026-10-01",
            "runLabel": "October 2026 research run",
            "score": 54.5
          }
        ],
        "editorialScores": {
          "ergonomics": 77,
          "maintenance": 59,
          "payments": 40,
          "reliability": 25,
          "schema": 58,
          "security": 66,
          "transparency": 50
        },
        "provenanceScore": 83,
        "checked": {
          "categories": {
            "ergonomics": "2026-10-27",
            "maintenance": "2026-10-27",
            "payments": "2026-10-27",
            "reliability": "2026-10-27",
            "schema": "2026-10-27",
            "security": "2026-10-27",
            "transparency": "2026-10-27"
          },
          "last": "2026-10-27",
          "oldest": "2026-10-27",
          "stale": false,
          "staleAfterDays": 90
        }
      },
      "connect": {
        "install": "curl -fsSL https://router.com/install.sh | sh   # Ramp CLI, configures Claude Code, Codex, OpenCode, Pi, Hermes or Conductor",
        "http": "curl https://api.router.com/v1/responses \\\n  -H \"Authorization: Bearer $RAMP_ROUTER_API_KEY\" \\\n  -H \"Content-Type: application/json\" \\\n  -d '{\"models\":[\"openai:gpt-5.4-mini\",\"fireworks:accounts/fireworks/models/kimi-k3\"],\"input\":\"Reply with one word: pong.\",\"max_output_tokens\":16}'"
      },
      "letme": {
        "capability": "https://letme.dev/inference.router",
        "tool": "https://letme.dev/ramp-router"
      },
      "area": "models",
      "unitPrices": [
        {
          "item": "Routing fee",
          "unit": "pct",
          "usd": 0,
          "note": "Free through 2026. Models are billed at list price"
        },
        {
          "item": "Claude Opus 5.5 input",
          "unit": "1m-tokens",
          "usd": 4,
          "note": "claude-opus-5-5, 1,000,000-token context"
        },
        {
          "item": "Claude Opus 5.5 output",
          "unit": "1m-tokens",
          "usd": 20
        },
        {
          "item": "GPT-6.1 Sol input",
          "unit": "1m-tokens",
          "usd": 2,
          "note": "gpt-6.1-sol, 1,050,000-token context"
        },
        {
          "item": "GPT-6.1 Sol output",
          "unit": "1m-tokens",
          "usd": 10
        },
        {
          "item": "Kimi K3 input",
          "unit": "1m-tokens",
          "usd": 3,
          "note": "kimi-k3, served by Fireworks or Baseten"
        },
        {
          "item": "Kimi K3 output",
          "unit": "1m-tokens",
          "usd": 15
        }
      ],
      "provenance": {
        "legalEntity": "Ramp Business Corporation",
        "domain": "router.com",
        "domainRegistered": "1995-07-26",
        "endpointOnVendorDomain": true,
        "terms": "https://ramp.com/legal/developer-terms/developer-terms/router-terms-of-service",
        "privacy": "https://ramp.com/legal/privacy-terms/privacy-terms/router-privacy-notice",
        "statusPage": "",
        "changelog": "",
        "securityTxt": "valid",
        "checked": "2026-10-27",
        "notes": [
          "The Router Terms of Service (last updated 31 August 2026) name Ramp Business Corporation, 28 W. 23rd Street, Floor 2, New York, NY 10010. The legal pages render with JavaScript, and the documents were read from the legal site's own script files.",
          "The Router Privacy Notice URL linked from router.com and the docs answers 301 to Ramp's general privacy policy. The notice itself, last updated 19 August 2026, exists only in the legal site's script bundle.",
          "No status page found. status.router.com does not resolve, router.com/status answers 404, and no status link appears in the docs or on router.com.",
          "No changelog found. The docs sitemap has none, and /changelog.md on docs.router.com returns the docs app shell. The Ramp CLI's tagged releases are the only dated release record.",
          "router.com/.well-known/security.txt gives security-external@ramp.com as the contact and expires on 18 March 2027.",
          "RDAP gives router.com a registration date of 26 July 1995 and Cloudflare, Inc. as registrar, so the domain predates Ramp. The earlier API host router-api.ramp.com still answers."
        ],
        "score": 83
      },
      "pageJsonUrl": "https://www.anchorterminal.com/tools/ramp-router.json",
      "live": {
        "slug": "ramp-router",
        "probe": {
          "target": "https://api.router.com/v1",
          "method": "get",
          "lastAt": "2026-10-28T01:25:59.300636114Z",
          "lastOk": true,
          "lastStatus": 401,
          "lastMs": 326,
          "lastNote": "asks for credentials",
          "authRequired": true,
          "uptime24h": 100,
          "uptime30d": 100,
          "p50ms24h": 329,
          "p95ms24h": 429,
          "samples24h": 18,
          "samples30d": 18,
          "days": [
            {
              "date": "2026-10-27",
              "probes": 3,
              "ok": 3
            },
            {
              "date": "2026-10-28",
              "probes": 15,
              "ok": 15
            }
          ]
        },
        "updatedAt": "2026-10-28T01:25:59.300636114Z"
      }
    },
    "facts": [
      {
        "a": "Model API",
        "b": "Model router",
        "name": "Kind"
      },
      {
        "a": "Meta",
        "b": "Ramp",
        "name": "Vendor"
      },
      {
        "a": "no (local only)",
        "b": "https://api.router.com/v1",
        "name": "Hosted endpoint"
      },
      {
        "a": "HTTP",
        "b": "HTTP",
        "name": "Transports"
      },
      {
        "a": "None",
        "b": "API key",
        "name": "Auth"
      },
      {
        "a": "Free",
        "b": "Pay per use",
        "name": "Pricing"
      },
      {
        "a": "no",
        "b": "no",
        "name": "x402"
      },
      {
        "a": "Muse Model Licence (source-available weights, not an OSI licence), free of charge with an attribution notice, a separate agreement with Meta before Model as a Service by a licensee group above $20M gross revenue, and the Muse Spark Open Usage Policy",
        "b": "Closed service under the Router Terms of Service (last updated 31 August 2026). The Ramp CLI that configures coding agents for Router is MIT.",
        "name": "Licence"
      },
      {
        "a": "no",
        "b": "no",
        "name": "Read-only variant documented"
      },
      {
        "a": "yes",
        "b": "yes",
        "name": "llms.txt"
      },
      {
        "a": "2026-10-15",
        "b": "2026-10-27",
        "name": "Last release"
      },
      {
        "a": "",
        "b": "",
        "name": "Terms last updated"
      },
      {
        "a": "no document linked",
        "b": "",
        "name": "Privacy policy last updated"
      },
      {
        "a": "",
        "b": "",
        "name": "Customer content may train models"
      },
      {
        "a": "",
        "b": "",
        "name": "Terms restrict automated access"
      },
      {
        "a": "",
        "b": "",
        "name": "Terms restrict benchmarking"
      },
      {
        "a": "",
        "b": "",
        "name": "Terms or service can change without notice"
      },
      {
        "a": "",
        "b": "",
        "name": "Arbitration or class-action waiver"
      },
      {
        "a": "none",
        "b": "1.7k npm/wk",
        "name": "Popularity"
      }
    ],
    "faq": [
      {
        "answer": "Router.com (Ramp Router) scores 54.5 (C) on agent readiness against Muse Spark Open's 53.5 (D), and leads in 3 of 7 scored categories. Muse Spark Open leads on reliability and payments \u0026 pricing.",
        "question": "Which is better for AI agents, Muse Spark Open or Router.com (Ramp Router)?"
      },
      {
        "answer": "Muse Spark Open needs no key. Router.com (Ramp Router) needs an API key.",
        "question": "Do Muse Spark Open and Router.com (Ramp Router) need an API key?"
      },
      {
        "answer": "No hosted endpoint is listed for Muse Spark Open. Router.com (Ramp Router) has a hosted endpoint at https://api.router.com/v1.",
        "question": "Can an agent call Muse Spark Open and Router.com (Ramp Router) without installing anything?"
      }
    ],
    "goodFor": [
      {
        "aheadOn": [
          "Reliability, 42 against 25",
          "Payments \u0026 pricing, 50 against 40"
        ],
        "also": [
          "No key needed to call it"
        ],
        "goodFor": "A team with a four-GPU Blackwell node, or two to four Mac Studios, that wants a 1M-token multimodal coding and agent model on its own hardware with no prompts leaving it.",
        "slug": "muse-spark-open",
        "watchFor": "The NVFP4 checkpoint (about 537 GB) serves on four B300 GPUs and the BF16 one (about 1.65 TB) on eight"
      },
      {
        "aheadOn": [
          "Agent ergonomics, 77 against 69",
          "Security \u0026 auth, 66 against 44",
          "Transparency \u0026 trust, 67 against 54"
        ],
        "also": [
          "A hosted endpoint, with nothing to install"
        ],
        "goodFor": "Teams in the US that want one key for OpenAI, Anthropic, xAI and open-weight models, with routing to cheaper tiers and per-request cost, and can switch off content recording.",
        "slug": "ramp-router",
        "watchFor": "Ramp-side content recording is on by default and keeps prompts, outputs and tool calls for one year"
      }
    ],
    "job": {
      "capability": "inference.llm",
      "name": "LLM inference"
    },
    "others": [
      {
        "json": "https://www.anchorterminal.com/compare/anthropic-api-vs-muse-spark-open.json",
        "title": "Claude API vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/anthropic-api-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/anthropic-api-vs-ramp-router.json",
        "title": "Claude API vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/anthropic-api-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/antseed-vs-muse-spark-open.json",
        "title": "Antseed vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/antseed-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/blockrun-ai-vs-muse-spark-open.json",
        "title": "BlockRun.AI vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/blockrun-ai-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/blockrun-ai-vs-ramp-router.json",
        "title": "BlockRun.AI vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/blockrun-ai-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cerebras-inference-vs-muse-spark-open.json",
        "title": "Cerebras Inference vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/cerebras-inference-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cerebras-inference-vs-ramp-router.json",
        "title": "Cerebras Inference vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/cerebras-inference-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-ai-gateway-vs-muse-spark-open.json",
        "title": "Cloudflare AI Gateway vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/cloudflare-ai-gateway-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-ai-gateway-vs-ramp-router.json",
        "title": "Cloudflare AI Gateway vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/cloudflare-ai-gateway-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-workers-ai-vs-muse-spark-open.json",
        "title": "Cloudflare Workers AI vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/cloudflare-workers-ai-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cloudflare-workers-ai-vs-ramp-router.json",
        "title": "Cloudflare Workers AI vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/cloudflare-workers-ai-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cohere-chat-vs-muse-spark-open.json",
        "title": "Cohere Chat API (Command models) vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/cohere-chat-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/cohere-chat-vs-ramp-router.json",
        "title": "Cohere Chat API (Command models) vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/cohere-chat-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/deepinfra-vs-muse-spark-open.json",
        "title": "DeepInfra vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/deepinfra-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/deepinfra-vs-ramp-router.json",
        "title": "DeepInfra vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/deepinfra-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/deepseek-api-vs-muse-spark-open.json",
        "title": "DeepSeek API vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/deepseek-api-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/deepseek-api-vs-ramp-router.json",
        "title": "DeepSeek API vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/deepseek-api-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/elorian-glimpse-vs-muse-spark-open.json",
        "title": "Glimpse vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/elorian-glimpse-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/elorian-glimpse-vs-ramp-router.json",
        "title": "Glimpse vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/elorian-glimpse-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/fireworks-inference-vs-muse-spark-open.json",
        "title": "Fireworks AI Inference vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/fireworks-inference-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/fireworks-inference-vs-ramp-router.json",
        "title": "Fireworks AI Inference vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/fireworks-inference-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/gemini-api-vs-muse-spark-open.json",
        "title": "Gemini Developer API vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/gemini-api-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/gemini-api-vs-ramp-router.json",
        "title": "Gemini Developer API vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/gemini-api-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groq-vs-muse-spark-open.json",
        "title": "GroqCloud vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/groq-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/groq-vs-ramp-router.json",
        "title": "GroqCloud vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/groq-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/jais-3-vs-muse-spark-open.json",
        "title": "Jais 3 vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/jais-3-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/jais-3-vs-ramp-router.json",
        "title": "Jais 3 vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/jais-3-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/meta-model-api-vs-muse-spark-open.json",
        "title": "Meta Model API vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/meta-model-api-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/meta-model-api-vs-ramp-router.json",
        "title": "Meta Model API vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/meta-model-api-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/minimax-api-vs-muse-spark-open.json",
        "title": "MiniMax API vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/minimax-api-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/minimax-api-vs-ramp-router.json",
        "title": "MiniMax API vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/minimax-api-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mistral-api-vs-muse-spark-open.json",
        "title": "Mistral AI API vs Muse Spark Open",
        "url": "https://www.anchorterminal.com/compare/mistral-api-vs-muse-spark-open"
      },
      {
        "json": "https://www.anchorterminal.com/compare/mistral-api-vs-ramp-router.json",
        "title": "Mistral AI API vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/mistral-api-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-nemotron-3-5-super-vl.json",
        "title": "Muse Spark Open vs Nemotron 3.5 Super VL",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-nemotron-3-5-super-vl"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-novita-ai.json",
        "title": "Muse Spark Open vs Novita AI",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-novita-ai"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-openai-api.json",
        "title": "Muse Spark Open vs OpenAI API",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-openai-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-openrouter.json",
        "title": "Muse Spark Open vs OpenRouter",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-openrouter"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-prism-inference.json",
        "title": "Muse Spark Open vs Prism Inference",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-prism-inference"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-reflection-beam.json",
        "title": "Muse Spark Open vs Beam 1.0",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-reflection-beam"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-routerplus.json",
        "title": "Muse Spark Open vs RouterPlus",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-routerplus"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-sambanova.json",
        "title": "Muse Spark Open vs SambaCloud",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-sambanova"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-siliconflow.json",
        "title": "Muse Spark Open vs SiliconFlow",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-siliconflow"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-stepfun-api.json",
        "title": "Muse Spark Open vs StepFun API",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-stepfun-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-together-inference.json",
        "title": "Muse Spark Open vs Together AI Inference",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-together-inference"
      },
      {
        "json": "https://www.anchorterminal.com/compare/muse-spark-open-vs-vercel-ai-gateway.json",
        "title": "Muse Spark Open vs Vercel AI Gateway",
        "url": "https://www.anchorterminal.com/compare/muse-spark-open-vs-vercel-ai-gateway"
      },
      {
        "json": "https://www.anchorterminal.com/compare/nemotron-3-5-super-vl-vs-ramp-router.json",
        "title": "Nemotron 3.5 Super VL vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/nemotron-3-5-super-vl-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/novita-ai-vs-ramp-router.json",
        "title": "Novita AI vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/novita-ai-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/openai-api-vs-ramp-router.json",
        "title": "OpenAI API vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/openai-api-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/openrouter-vs-ramp-router.json",
        "title": "OpenRouter vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/openrouter-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/prism-inference-vs-ramp-router.json",
        "title": "Prism Inference vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/prism-inference-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/ramp-router-vs-reflection-beam.json",
        "title": "Router.com (Ramp Router) vs Beam 1.0",
        "url": "https://www.anchorterminal.com/compare/ramp-router-vs-reflection-beam"
      },
      {
        "json": "https://www.anchorterminal.com/compare/ramp-router-vs-sambanova.json",
        "title": "Router.com (Ramp Router) vs SambaCloud",
        "url": "https://www.anchorterminal.com/compare/ramp-router-vs-sambanova"
      },
      {
        "json": "https://www.anchorterminal.com/compare/ramp-router-vs-siliconflow.json",
        "title": "Router.com (Ramp Router) vs SiliconFlow",
        "url": "https://www.anchorterminal.com/compare/ramp-router-vs-siliconflow"
      },
      {
        "json": "https://www.anchorterminal.com/compare/ramp-router-vs-stepfun-api.json",
        "title": "Router.com (Ramp Router) vs StepFun API",
        "url": "https://www.anchorterminal.com/compare/ramp-router-vs-stepfun-api"
      },
      {
        "json": "https://www.anchorterminal.com/compare/ramp-router-vs-together-inference.json",
        "title": "Router.com (Ramp Router) vs Together AI Inference",
        "url": "https://www.anchorterminal.com/compare/ramp-router-vs-together-inference"
      },
      {
        "json": "https://www.anchorterminal.com/compare/antseed-vs-ramp-router.json",
        "title": "Antseed vs Router.com (Ramp Router)",
        "url": "https://www.anchorterminal.com/compare/antseed-vs-ramp-router"
      },
      {
        "json": "https://www.anchorterminal.com/compare/ramp-router-vs-routerplus.json",
        "title": "Router.com (Ramp Router) vs RouterPlus",
        "url": "https://www.anchorterminal.com/compare/ramp-router-vs-routerplus"
      },
      {
        "json": "https://www.anchorterminal.com/compare/ramp-router-vs-vercel-ai-gateway.json",
        "title": "Router.com (Ramp Router) vs Vercel AI Gateway",
        "url": "https://www.anchorterminal.com/compare/ramp-router-vs-vercel-ai-gateway"
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    ],
    "scores": [
      {
        "by": 17,
        "edge": "muse-spark-open",
        "key": "reliability",
        "muse-spark-open": 42,
        "name": "Reliability",
        "ramp-router": 25,
        "weight": 16
      },
      {
        "key": "performance",
        "name": "Performance",
        "pending": true,
        "weight": 10
      },
      {
        "by": 3,
        "edge": "muse-spark-open",
        "key": "schema",
        "muse-spark-open": 61,
        "name": "Schema \u0026 documentation",
        "ramp-router": 58,
        "weight": 13
      },
      {
        "by": 8,
        "edge": "ramp-router",
        "key": "ergonomics",
        "muse-spark-open": 69,
        "name": "Agent ergonomics",
        "ramp-router": 77,
        "weight": 13
      },
      {
        "by": 22,
        "edge": "ramp-router",
        "key": "security",
        "muse-spark-open": 44,
        "name": "Security \u0026 auth",
        "ramp-router": 66,
        "weight": 14
      },
      {
        "by": 10,
        "edge": "muse-spark-open",
        "key": "payments",
        "muse-spark-open": 50,
        "name": "Payments \u0026 pricing",
        "ramp-router": 40,
        "weight": 10
      },
      {
        "key": "tasks",
        "name": "Task success",
        "pending": true,
        "weight": 10
      },
      {
        "by": 1,
        "edge": "muse-spark-open",
        "key": "maintenance",
        "muse-spark-open": 60,
        "name": "Maintenance \u0026 community",
        "ramp-router": 59,
        "weight": 7
      },
      {
        "by": 13,
        "edge": "ramp-router",
        "key": "transparency",
        "muse-spark-open": 54,
        "name": "Transparency \u0026 trust",
        "ramp-router": 67,
        "weight": 7
      }
    ],
    "summary": "Router.com (Ramp Router) scores 54.5 (C) on agent readiness against Muse Spark Open's 53.5 (D), and leads in 3 of 7 scored categories. Muse Spark Open leads on reliability and payments \u0026 pricing. Both do llm inference.",
    "tutorials": [],
    "verdicts": {
      "muse-spark-open": "Muse Spark Open runs on the owner's hardware in seven runtimes, with OpenAI-compatible servers in vLLM and SGLang, standard tool calls, a 1M-token context and Meta's own serving docs. Serving the 537 GB NVFP4 checkpoint takes four B300 GPUs, Meta's download is gated by manual review, and the licence adds attribution and a revenue threshold for model resellers.",
      "ramp-router": "Detailed Markdown docs with typed error codes, per-model capability data and routing an agent can set per request. No OpenAPI document, status page, changelog or published rate limits were found. Signup needs a US business email in a browser, and Ramp records prompts and outputs for a year by default unless switched off."
    }
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  "markdown": "Router.com (Ramp Router) scores 54.5 (C) on agent readiness against Muse Spark Open's 53.5 (D), and leads in 3 of 7 scored categories. Muse Spark Open leads on reliability and payments \u0026 pricing. Both do llm inference.\n\n- Muse Spark Open: grade D, 53.5/100, rank #823 of 1218. Markdown https://www.anchorterminal.com/tools/muse-spark-open.md · JSON https://www.anchorterminal.com/api/v1/tools/muse-spark-open.json\n- Router.com (Ramp Router): grade C, 54.5/100, rank #798 of 1218. Markdown https://www.anchorterminal.com/tools/ramp-router.md · JSON https://www.anchorterminal.com/api/v1/tools/ramp-router.json\n- Best model APIs and inference for AI agents: https://www.anchorterminal.com/best/inference/index.md\n- All 466 models comparisons: https://www.anchorterminal.com/compare/inference/index.md\n\n## Which one, for what\n\n### Muse Spark Open (D)\n\nGood for: A team with a four-GPU Blackwell node, or two to four Mac Studios, that wants a 1M-token multimodal coding and agent model on its own hardware with no prompts leaving it.\n\nAhead on:\n- Reliability, 42 against 25\n- Payments \u0026 pricing, 50 against 40\n\nAlso in its favour:\n- No key needed to call it\n\nWatch for: The NVFP4 checkpoint (about 537 GB) serves on four B300 GPUs and the BF16 one (about 1.65 TB) on eight\n\n### Router.com (Ramp Router) (C)\n\nGood for: Teams in the US that want one key for OpenAI, Anthropic, xAI and open-weight models, with routing to cheaper tiers and per-request cost, and can switch off content recording.\n\nAhead on:\n- Agent ergonomics, 77 against 69\n- Security \u0026 auth, 66 against 44\n- Transparency \u0026 trust, 67 against 54\n\nAlso in its favour:\n- A hosted endpoint, with nothing to install\n\nWatch for: Ramp-side content recording is on by default and keeps prompts, outputs and tool calls for one year\n\n\n## Score by category\n\n| Category | Weight | Muse Spark Open | Router.com (Ramp Router) | Edge |\n| --- | --- | --- | --- | --- |\n| Reliability | 16% (20 this run) | 42 | 25 | Muse Spark Open +17 |\n| Performance | 10%, pending | pending | pending | not scored in this run |\n| Schema \u0026 documentation | 13% (16.2 this run) | 61 | 58 | Muse Spark Open +3 |\n| Agent ergonomics | 13% (16.2 this run) | 69 | 77 | Router.com (Ramp Router) +8 |\n| Security \u0026 auth | 14% (17.5 this run) | 44 | 66 | Router.com (Ramp Router) +22 |\n| Payments \u0026 pricing | 10% (12.5 this run) | 50 | 40 | Muse Spark Open +10 |\n| Task success | 10%, pending | pending | pending | not scored in this run |\n| Maintenance \u0026 community | 7% (8.8 this run) | 60 | 59 | Muse Spark Open +1 |\n| Transparency \u0026 trust | 7% (8.8 this run) | 54 | 67 | Router.com (Ramp Router) +13 |\n| Negative events | ≤15 | 0 | 0 | |\n| **Total** | | **53.5 · D** | **54.5 · C** | |\n\n## Facts side by side\n\n| Fact | Muse Spark Open | Router.com (Ramp Router) |\n| --- | --- | --- |\n| Kind | Model API | Model router |\n| Vendor | Meta | Ramp |\n| Hosted endpoint | no (local only) | `https://api.router.com/v1` |\n| Transports | HTTP | HTTP |\n| Auth | None | API key |\n| Pricing | Free | Pay per use |\n| x402 | no | no |\n| Licence | Muse Model Licence (source-available weights, not an OSI licence), free of charge with an attribution notice, a separate agreement with Meta before Model as a Service by a licensee group above $20M gross revenue, and the Muse Spark Open Usage Policy | Closed service under the Router Terms of Service (last updated 31 August 2026). The Ramp CLI that configures coding agents for Router is MIT. |\n| Read-only variant documented | no | no |\n| llms.txt | yes | yes |\n| Last release | 2026-10-15 | 2026-10-27 |\n| Terms last updated |  |  |\n| Privacy policy last updated | no document linked |  |\n| Customer content may train models |  |  |\n| Terms restrict automated access |  |  |\n| Terms restrict benchmarking |  |  |\n| Terms or service can change without notice |  |  |\n| Arbitration or class-action waiver |  |  |\n| Popularity | none | 1.7k npm/wk |\n\n## Verdicts\n\n**Muse Spark Open.** Muse Spark Open runs on the owner's hardware in seven runtimes, with OpenAI-compatible servers in vLLM and SGLang, standard tool calls, a 1M-token context and Meta's own serving docs. Serving the 537 GB NVFP4 checkpoint takes four B300 GPUs, Meta's download is gated by manual review, and the licence adds attribution and a revenue threshold for model resellers.\n\n**Router.com (Ramp Router).** Detailed Markdown docs with typed error codes, per-model capability data and routing an agent can set per request. No OpenAPI document, status page, changelog or published rate limits were found. Signup needs a US business email in a browser, and Ramp records prompts and outputs for a year by default unless switched off.\n\n## Before you call either\n\n### Muse Spark Open\n\n1. Start vLLM or SGLang with `--reasoning-parser muse --tool-call-parser muse` (vLLM also `--enable-auto-tool-choice`), or tool calls come back as raw text\n2. Set `reasoning_effort` to `low` or `medium` for short tasks. The default is `xhigh`, reasoning can't be turned off, and other values return an error\n3. Stop only on `\u003c|eot|\u003e` and end of text. Stopping on `\u003c|eom|\u003e` cuts off tool calls and final answers\n4. Stream long generations and leave `max_tokens` room for reasoning, or `content` can come back empty with `finish_reason` `length`\n5. Don't call Meta Model API for this model. Use a self-hosted server or a hosted provider's model string, such as `meta-models/muse-spark-open`\n\n### Router.com (Ramp Router)\n\n1. Switch off content recording in Settings before sending private data. It is on by default and keeps prompts and outputs for a year\n2. Read model ids from `GET /v1/models` at runtime. Ids are account-specific, an unknown one is a 404, and Gemini ids need your own Google key\n3. Use `POST /v1/responses` with a `models` list for fallbacks. Router stops falling back once a stream has started\n4. Set `fallback_timeout` and `provider_timeout`, or `allow_flex_tier: false`, when latency matters. Flex routing is on by default\n5. Treat both `401 invalid_api_key` and `401 api_key_deactivated` as a possibly locked key, and stop retrying on `402`\n\n## Questions\n\n### Which is better for AI agents, Muse Spark Open or Router.com (Ramp Router)?\n\nRouter.com (Ramp Router) scores 54.5 (C) on agent readiness against Muse Spark Open's 53.5 (D), and leads in 3 of 7 scored categories. Muse Spark Open leads on reliability and payments \u0026 pricing.\n\n### Do Muse Spark Open and Router.com (Ramp Router) need an API key?\n\nMuse Spark Open needs no key. Router.com (Ramp Router) needs an API key.\n\n### Can an agent call Muse Spark Open and Router.com (Ramp Router) without installing anything?\n\nNo hosted endpoint is listed for Muse Spark Open. Router.com (Ramp Router) has a hosted endpoint at https://api.router.com/v1.\n\n\n## For agents\n\n- This comparison as JSON: https://www.anchorterminal.com/compare/muse-spark-open-vs-ramp-router.json, and with the fewest tokens: https://www.anchorterminal.com/compare/muse-spark-open-vs-ramp-router.min.md\n- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {\"a\": \"muse-spark-open\", \"b\": \"ramp-router\"}`. From a terminal: `anchor compare muse-spark-open ramp-router`\n- Each listing in full: https://www.anchorterminal.com/api/v1/tools/muse-spark-open.json and https://www.anchorterminal.com/api/v1/tools/ramp-router.json\n\n## Other comparisons with Muse Spark Open or Router.com (Ramp Router)\n\n- [Claude API vs Muse Spark Open](https://www.anchorterminal.com/compare/anthropic-api-vs-muse-spark-open.md)\n- [Claude API vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/anthropic-api-vs-ramp-router.md)\n- [Antseed vs Muse Spark Open](https://www.anchorterminal.com/compare/antseed-vs-muse-spark-open.md)\n- [BlockRun.AI vs Muse Spark Open](https://www.anchorterminal.com/compare/blockrun-ai-vs-muse-spark-open.md)\n- [BlockRun.AI vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/blockrun-ai-vs-ramp-router.md)\n- [Cerebras Inference vs Muse Spark Open](https://www.anchorterminal.com/compare/cerebras-inference-vs-muse-spark-open.md)\n- [Cerebras Inference vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/cerebras-inference-vs-ramp-router.md)\n- [Cloudflare AI Gateway vs Muse Spark Open](https://www.anchorterminal.com/compare/cloudflare-ai-gateway-vs-muse-spark-open.md)\n- [Cloudflare AI Gateway vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/cloudflare-ai-gateway-vs-ramp-router.md)\n- [Cloudflare Workers AI vs Muse Spark Open](https://www.anchorterminal.com/compare/cloudflare-workers-ai-vs-muse-spark-open.md)\n- [Cloudflare Workers AI vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/cloudflare-workers-ai-vs-ramp-router.md)\n- [Cohere Chat API (Command models) vs Muse Spark Open](https://www.anchorterminal.com/compare/cohere-chat-vs-muse-spark-open.md)\n- [Cohere Chat API (Command models) vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/cohere-chat-vs-ramp-router.md)\n- [DeepInfra vs Muse Spark Open](https://www.anchorterminal.com/compare/deepinfra-vs-muse-spark-open.md)\n- [DeepInfra vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/deepinfra-vs-ramp-router.md)\n- [DeepSeek API vs Muse Spark Open](https://www.anchorterminal.com/compare/deepseek-api-vs-muse-spark-open.md)\n- [DeepSeek API vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/deepseek-api-vs-ramp-router.md)\n- [Glimpse vs Muse Spark Open](https://www.anchorterminal.com/compare/elorian-glimpse-vs-muse-spark-open.md)\n- [Glimpse vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/elorian-glimpse-vs-ramp-router.md)\n- [Fireworks AI Inference vs Muse Spark Open](https://www.anchorterminal.com/compare/fireworks-inference-vs-muse-spark-open.md)\n- [Fireworks AI Inference vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/fireworks-inference-vs-ramp-router.md)\n- [Gemini Developer API vs Muse Spark Open](https://www.anchorterminal.com/compare/gemini-api-vs-muse-spark-open.md)\n- [Gemini Developer API vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/gemini-api-vs-ramp-router.md)\n- [GroqCloud vs Muse Spark Open](https://www.anchorterminal.com/compare/groq-vs-muse-spark-open.md)\n- [GroqCloud vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/groq-vs-ramp-router.md)\n- [Jais 3 vs Muse Spark Open](https://www.anchorterminal.com/compare/jais-3-vs-muse-spark-open.md)\n- [Jais 3 vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/jais-3-vs-ramp-router.md)\n- [Meta Model API vs Muse Spark Open](https://www.anchorterminal.com/compare/meta-model-api-vs-muse-spark-open.md)\n- [Meta Model API vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/meta-model-api-vs-ramp-router.md)\n- [MiniMax API vs Muse Spark Open](https://www.anchorterminal.com/compare/minimax-api-vs-muse-spark-open.md)\n- [MiniMax API vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/minimax-api-vs-ramp-router.md)\n- [Mistral AI API vs Muse Spark Open](https://www.anchorterminal.com/compare/mistral-api-vs-muse-spark-open.md)\n- [Mistral AI API vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/mistral-api-vs-ramp-router.md)\n- [Muse Spark Open vs Nemotron 3.5 Super VL](https://www.anchorterminal.com/compare/muse-spark-open-vs-nemotron-3-5-super-vl.md)\n- [Muse Spark Open vs Novita AI](https://www.anchorterminal.com/compare/muse-spark-open-vs-novita-ai.md)\n- [Muse Spark Open vs OpenAI API](https://www.anchorterminal.com/compare/muse-spark-open-vs-openai-api.md)\n- [Muse Spark Open vs OpenRouter](https://www.anchorterminal.com/compare/muse-spark-open-vs-openrouter.md)\n- [Muse Spark Open vs Prism Inference](https://www.anchorterminal.com/compare/muse-spark-open-vs-prism-inference.md)\n- [Muse Spark Open vs Beam 1.0](https://www.anchorterminal.com/compare/muse-spark-open-vs-reflection-beam.md)\n- [Muse Spark Open vs RouterPlus](https://www.anchorterminal.com/compare/muse-spark-open-vs-routerplus.md)\n- [Muse Spark Open vs SambaCloud](https://www.anchorterminal.com/compare/muse-spark-open-vs-sambanova.md)\n- [Muse Spark Open vs SiliconFlow](https://www.anchorterminal.com/compare/muse-spark-open-vs-siliconflow.md)\n- [Muse Spark Open vs StepFun API](https://www.anchorterminal.com/compare/muse-spark-open-vs-stepfun-api.md)\n- [Muse Spark Open vs Together AI Inference](https://www.anchorterminal.com/compare/muse-spark-open-vs-together-inference.md)\n- [Muse Spark Open vs Vercel AI Gateway](https://www.anchorterminal.com/compare/muse-spark-open-vs-vercel-ai-gateway.md)\n- [Nemotron 3.5 Super VL vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/nemotron-3-5-super-vl-vs-ramp-router.md)\n- [Novita AI vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/novita-ai-vs-ramp-router.md)\n- [OpenAI API vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/openai-api-vs-ramp-router.md)\n- [OpenRouter vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/openrouter-vs-ramp-router.md)\n- [Prism Inference vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/prism-inference-vs-ramp-router.md)\n- [Router.com (Ramp Router) vs Beam 1.0](https://www.anchorterminal.com/compare/ramp-router-vs-reflection-beam.md)\n- [Router.com (Ramp Router) vs SambaCloud](https://www.anchorterminal.com/compare/ramp-router-vs-sambanova.md)\n- [Router.com (Ramp Router) vs SiliconFlow](https://www.anchorterminal.com/compare/ramp-router-vs-siliconflow.md)\n- [Router.com (Ramp Router) vs StepFun API](https://www.anchorterminal.com/compare/ramp-router-vs-stepfun-api.md)\n- [Router.com (Ramp Router) vs Together AI Inference](https://www.anchorterminal.com/compare/ramp-router-vs-together-inference.md)\n- [Antseed vs Router.com (Ramp Router)](https://www.anchorterminal.com/compare/antseed-vs-ramp-router.md)\n- [Router.com (Ramp Router) vs RouterPlus](https://www.anchorterminal.com/compare/ramp-router-vs-routerplus.md)\n- [Router.com (Ramp Router) vs Vercel AI Gateway](https://www.anchorterminal.com/compare/ramp-router-vs-vercel-ai-gateway.md)\n",
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